I don't change it. I have used Simple Black with Texture since I discovered it last fall. It provides a "Palm dark" look for several apps without changing the launcher background or any icons. It's perfect for me; I haven't bothered with looking at other themes.

Except for a brief sojourn when it wasn't available, I have always used Asia. Love it. Added the glass patch (not suite, not compatible with this theme, I don't think) when it became available in Preware.